Vaccine Effectiveness

Vaccine effectiveness measures how well a vaccine protects people from illness in real-world conditions. It compares the risk of getting infected or sick among vaccinated individuals versus those unvaccinated. For example, if a vaccine has 90% effectiveness, it means vaccinated people are 90% less likely to get the disease compared to those who are unvaccinated. Effectiveness can vary based on factors like the virus variant and the population. Overall, a high effectiveness indicates that the vaccine is very good at preventing illness and helps reduce the spread of the disease in the community.